CONTENTS 



PAGE 



II. OPERATION OF A MOTOR WITH CONSTANT EXCITATION, SUP- 

 PLIED AT CONSTAT E.M.F 49 



Maximum Power Means of Determining the Practical Stability of 

 Synchronous Motors Variations of Stability with Operating Conditions 

 Numerical Example. 



III. COMPARISON OF POSSIBLE OUTPUTS AT CONSTANT LOAD WITH 



VARIOUS EXCITATIONS. CONSTANT POTENTIAL SUPPLY 55 



Existence of a Current-Minimum V-Curves Use of Diagram of 

 the First Kind Predetermination of V-Curves Theoretical Form of 

 V-Curves Curve of Reactive Current Expression for Reactive Current 

 Comparison of Outputs which the Same Alternator Can Devel.op with 

 the Same Terminal Voltage, when used either as a Generator or as a 

 Motor. 



IV. INFLUENCE OF MOTORS ON THE GENERAL OPERATION OF AN 



A.C. ELECTRICAL DISTRIBUTION SYSTEM 64 



Effect of Current of Synchronous Motors on Distribution Systems 

 Compensation with Respect to the Line or Circuit First Numerical 

 Example Second Numerical Example Economic Study of Compensa- 

 tion for the Line of Means of Motors Running without Lgad Saving in 

 Cost of Equipment Saving in Annual Operating Cost Numerical 

 Example Table I, Saving in Cost of Equipment Table II, Saving in 

 Operating Cost Table III, Numerical Example Economy of Compensa- 

 tion for the Distributing System by Means of Synchronous Motors 

 Running with Load Numerical Example Regulation of Distribution- 

 Voltage Compensation with Respect to the Generators Numerical 

 Example Comparison between Synchronous and Induction Motors 

 Use of Synchronous Motors to Raise Power-factor in America. 



CHAPTER III. ADDITIONS TO THE THEORY. SECOND APPROX- 

 IMATION 91 



Imperfections of the Theory Variations of Reactance with Lag of 

 Current and Saturation of Fields. Armature Reaction First Applica- 

 tion of Corrected Diagram Determination of Reactive Current as a 

 Function of the Excitation, with Constant Active Current Particular 

 Case where the Permeability of the Field-Circuit is Constant and the 

 Two Reaction-Coefficients are Equal Second Application. Operation 

 with Constant Excitation, on Constant-Potential Supply System 

 V-Curves Influence of Field-Saturation on Stability Influence of 

 the Wave-Form of E.M.F. Simplified Diagrams. 



